[avr-gcc-list] printf_P + PSTR("\n\r") does not seem to work, however ("\r\n") is okay

[Bernard Fouché]

Hi there.

Following a typo in a string, it seems that the sequence "\r\n" is not
correctly processed
by printf_P. I'm running the following code on a ATMEGA162V. The serial port
is setup at 4800 bps.

If I do printf_P(PSTR("\r\n")); everything is okay, however if I switch it
to "\n\r", I get no output. Did I miss something or is it a bug?

Thanks!

        Bernard

// Uncomment the following define to show the problem
//#define       SHOW_PROBLEM

#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <stdio.h>

int myputc(char c)
{
  /* output character to UART0 */
  while ((UCSR0A & BV(UDRE0)) == 0)
    wdt_reset();
  UDR0 = c;
  return 0;
}

int main()
{
  wdt_enable(WDTO_2S);
  //  port_init();
  // Quartz is at 4Mhz, go down to 1Mhz
  cli();
  CLKPR=0x80;
  CLKPR=0x02;
  sei();
  // Setup UART
  UCSR0B = 0x00;
  UCSR0A = 0x00;
  UBRR0L = 0x0C;
  UBRR0H = 0x00;
  UCSR0A = 0x00;
  UCSR0B = (1<<RXCIE0)|(1<<RXEN0)|(1<<TXEN0);

  fdevopen(myputc,NULL,0);
  printf_P(PSTR("\n\rHello 1!\n\r"));
  printf_P(PSTR("\n\rHello 2!\n\r"));
#ifdef SHOW_PROBLEM
  printf_P(PSTR("\r\nHello 3!\r\n"));
  printf_P(PSTR("\r\nHello 4!\r\n"));
#endif
  while(1)
    wdt_reset();
}